You would need the full embed code from the hosting site listed in the iframe: most sites make this easily available in a Share button or similar. The video does have to be hosted at one of the "whitelisted" (permitted) sites listed at the multimedia post; if it's not, the HTML sanitizer will strip out the code. If you have any questions about a specific site, please contact Support!
For YouTube, you'll want to browse to the video's page, click on the Share button, click on Embed, and copy everything in the box that appears, not just the URL. If you have any questions, let us know!
Comment on Tutorial: HTML Sanitizing and Parsing
Sam of Support (AO3_Support) (Official) Wed 01 Jul 2015 12:39AM UTC
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TheAnderfelsOne Sun 05 Jul 2015 11:21PM UTC
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Sam of Support (AO3_Support) (Official) Mon 06 Jul 2015 12:13PM UTC
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